Application-Consistent Protection for MySQL on Kubernetes

Updated

Applies to: On-premises access nodes only

You can add a pre-process script file or a post-process script file for MySQL on the Kubernetes access nodes.

Example Pre-Process Script

The following example is a pre-process script for MySQL. Edit the example script to include MySQL user credentials with root ownership.

# cat /opt/commvault/Base/kscripts/cluster_name/mydatabase.myapplication.prescript

#!/usr/bin/env python

import pymysql.cursors

import os

import time

import datetime

dt=datetime.datetime.now().strftime("%I:%M%p on %B %d, %Y")

file1 = open("/scripts/pre-freeze.log","a+" )

try:

conn = pymysql.connect (host='localhost' , user='<MYSQL USER>' , password='<USER PASSWORD>',

charset='utf8mb4',

cursorclass=pymysql.cursors.DictCursor )

with conn.cursor() as cur:

cur.execute ("select version()")

data = cur.fetchone()

file1.write (dt)

file1.write ("-------------------------------------------\n")

file1.write ("-------------------------------------------\n")

file1.write ("\t MySQL version is %s: "%data)

file1.write ("-------------------------------------------\n")

file1.write ("-------------------------------------------\n")

except:

file1.write (dt)

file1.write("\t unable to connect to MySQL server\n")

try:

cur = conn.cursor()

cur.execute (" flush tables with read lock ")

file1.write (dt)

file1.write ("\t using quiesce.py script - quiesce of database successful \n")

except:

file1.write(dt)

file1.write( "\n unexpected error from MySQL, unable to do flush tables with read lock, Please check MySQL error logs for more info\n")

finally:

cur.close()

conn.close()

file1.close()

Example Post-Process Script

The following example is a post-process script for MySQL. Edit the example script to include MySQL user credentials with root ownership.

# cat /opt/commvault/Base/kscripts/mydatabase.myapplication.postscript

#!/usr/bin/env python

import pymysql.cursors

import os

import time

import datetime

dt=datetime.datetime.now().strftime("%I:%M%p on %B %d, %Y")

file1 = open("/scripts/post-thaw.log","a+" )

try:

conn = pymysql.connect (host='localhost' , user='<MYSQL USER>' , password='<USER PASSWORD>',

charset='utf8mb4',

cursorclass=pymysql.cursors.DictCursor )

cur = conn.cursor()

cur.execute ("select version()")

data = cur.fetchone()

file1.write (dt)

file1.write ("-------------------------------------------\n")

file1.write ("-------------------------------------------\n")

file1.write ("\t MySQL version is %s: "%data)

file1.write ("-------------------------------------------\n")

file1.write ("-------------------------------------------\n")

except:

file1.write (dt)

file1.write("\t unable to connect to MySQL server\n")

try:

file1.write (dt)

file1.write ("\t executing query to unquiesce the database \n")

cur.execute ("unlock tables")

file1.write (dt)

file1.write ("\t Database is in unquiesce mode now \n")

except:

file1.write(dt)

file1.write( "\n unexpected error from MySQL, unable to unlock tables. Please check MySql error logs for more info \n")

finally:

cur.close()

conn.close()

file1.close()

Output and Log Files

Output from the scripts is written to the following files on your production MySQL pod:

  • Pre-execution script: /scripts/pre-freeze.log

  • Post-execution script: /scripts/pre-thaw.log

To modify the paths, edit the scripts that are stored on your access nodes.

Caution

  • There is no log rotation implemented in these log files. Restore to a file system that has appropriate disk space.

  • Commvault does not log the return codes of pre- and post-scripts on the access node.